.l-draggable-demo{
    background-size: 30px 30px, 30px 30px;
    background-image: linear-gradient(rgba(0, 0, 0, .1) 1px, transparent 0px), linear-gradient(90deg, rgba(0, 0, 0, .1) 1px, transparent 0px);
    position:relative;
    height:400px;
    width: 100%;
}